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HTC's Windows Phone lineup: the Radar and the Titan

HTC announced the Radar and the Titan, two new smartphones running Microsoft's Windows Phone 7 operating system, on Thursday.

Both phones will run Microsoft's latest mobile OS, Windows Phone 7 Mango, and hit U.S. carriers before the end of the year, after launching in Europe and Asia first, HTC said in a statement.

The Titan will feature a large 4.7-inch touchscreen, which HTC said will be its largest screen size to date. The Radar will be a bit smaller, with a 3.8-inch display, and both phones will make use of aluminum bodies, the hardware maker said.

The devices also will come loaded with an app called HTC Watch, which offers a selection of the "latest premium movies and TV shows right at your fingertips" and HTC Photo Enhancer which can be used to "quickly touch up pictures and upload them to Facebook, tagging your friends as you go using automatic face detection built into Windows Phones."

A first for Windows Phone, Mango will enable handsets to take advantage of front-facing cameras for video calls, and as such, the Radar and Titan have cameras up front. Out back on both phones, a still and video camera can be found, each capable of shooting up to 720p video.